Add "no dates" column to Timeline View

If it’s not clear what I’m leading to, I can tell you more

@alex.mart So far you can click icon near Step-Project Timeline title and it show all items with no dates. We will improve it later.

Ok, this very nice feature was hide from me. It’s difficult to find it.
Thanks for “timeline backlog”

But i can not drop it to timeline! (and set some range of dates in the same time) like i can drop it inside timeline.